Majority of the SEO professionals, internet marketers are using Google traffic estimator tool. But it may provide some problems because these are showing using clicks per day data. I have investigated possible ways on how to convert possibly clicks per day data to Google monthly searches.

This study presents the following analysis:

a.) to convert Google traffic estimator clicks per day to actual Google searches, a %CTR of 24.77% is used. You may ask why and these are the reasons (presuming negligible amount will click on the Google second page):
-The total %click through of 1st page organic results are about 69.23 %, determined from our previous experiment (1st position=39.45%, 2nd position=9.42%, 3rd position=6.87%, position 4-10=13.49% total) then the %CTR for ad words are 100-69.23%= 30.77%.
-Presuming there are ten ad word positions in the page and 20% of ten positions will received 80% of the clicks (80/20 rule), the top ads will received 80% x 30.77% ~24.77%.

-During the gathering of ad words click per day data in traffic estimator, it is customized in such a way Google will estimate the number of clicks when the ad is at Top three positions in order for us to use 24.77% correctly.

Based on this analysis the formula to convert traffic estimator clicks per data to actual searches per day are:

Google searches per day= Google estimator clicks per day (at Top three positions) / 24.77%
To convert to monthly figures just multiply by 30.
For example supposing there are two clicks per day. This is roughly equivalent to:
Google searches per day= 2/0.2477~ eight searches per day
For the entire month this is equal to eight x 30 = 240 searches per month.

The searches is already feasible and useful when compared to actual analytics data (like Google analytics), but this is not entirely very accurate.